Question

Find an explicit rule for the nth term of a geometric sequence where the second and fifth terms are -36 and 2304, respectively.

an = 9 • 4^n

an = 9 • (-4)^n + 1

an = 9 • 4^n - 1

an = 9 • (-4)^n - 1

Answer 1

replace n in each formula with 2, you should get -36
replace n in each formula with 5, you should get 2304

hint start with the last one..

Answer 2

thanks:)